Présentation effectuée au Rendez-vous de l'AFUP Paris le 20 janvier 2015 par Olivier Zemrag

1. Tips for MySQL Performance
in 30mn
AFUP
20 Janvier 2015
Olivier Zemrag
MySQL Architect

2. About me
Wonderful 18 Years of IT Technology
More than 10 Years with MySQL family
Worked with startups large compagnie such as L’OREAL, ALCATEL,
ORANGE, ...
MySQL & open source user since 2000
MySQL Consultant in 2006 at ANASKA
MySQL consultant at SUN in 2008
6 years member of MySQL Oracle Team
Now MySQL Architect

3. Agenda
Introduction
Configuration
Hardware
Design

4. MySQL popularity performance
http://db-engines.com

5. Find the 'next' Bottleneck
Bench your work load
Test test test
Monitor monitor monitor
Think cost / effort
Change one thing at a time
Test test test
Monitor monitor monitor

6. Configuration
● Buffer pool
● Log file size
● Other variables

7. Use large Buffer Pool
● The most important variable with InnoDB
Example : for 32G use 20G for
innodb_buffer_pool_size (or even more)
● Be aware off swaping and other settings !!

8. Tunne Innodb Log files
For .write heavy workloads use big
Innodb_log_file_size
Be aware of time of restart process
Take caution when you change it

9. Other variables
● innodb_file_per_table=1
● innodb_stat_on_metadata=OFF
● Check :
– Innodb_flush_at_trx_commit (Durability)
– innodb_flush_method (O_DIRECT)
– skip_name_resolved
● Leave all other variables to default unless you
know what you do or change per session only

10. hardware
● RAM
● CPU
● Storage

11. CPU
● Faster is better for query response time
● More cores for more concurrency

12. MEMORY
● Size of the frequently used data (working set)
● Check response time and throughput

13. Storage
● RAID10
● SSD
● Fusion IO
● SAN
● Mix :
– HDD : log-bin, log-files
– SSD : datadir, innodb_undo_directory, tmpdir

14. Design
● Optmize, purge, archive data
● Proper Indexation
● Proper usage of temporary tables
– Example of usage of performance_schema to find
queries creating temporary tables (version 5.6)
SELECT * FROM
events_statements_summary_by_digest
WHERE SUM_CREATED_TMP_TABLES > 0

15. Other Tips & Futures
● Optimize your OS, Optimize your Network
● NoSQL with memcached & InnoDB
● NDB (MySQL Cluster) for high write workloads
● Mix & match InnoDB, memcacehd, NDB Cluster
● MySQL Fabric for sharding

16. Merci
Questions ?
Olivier Zemrag
http://ozemrag.blogspot.fr/